Set optional values

CALL FFSET (CHOPT, IVALUE)

This will set some optional values which are identified by the character argu- ment CHOPT to the integer value given by IVALUE, if that is valid. Options are:

LINP

Set input logical unit to given value. IVALUE must be a valid logical unit number.

LOUT

Set output logical unit to given value. IVALUE must be a valid logical unit number.

SIZE

Set the significant size of a key (in characters). IVALUE must be in the range from 4 to 32.

If called with option 'SIZE', FFSET must be called after FFINIT and before the first call to FFKEY is made; otherwise, an error message is printed. The input and output logical units may be changed at any time.